The purpose of this study is to analyze the hydrology and hydraulics of the existing drainageways within the study area, develop alternative planning concepts to mitigate flood damages, and prepare a conceptual design of an alternative selected by the COLA, BC, and MHFD. The information on this website is intended to support the project stakeholders and other users by keeping it updated with all on-going activities such as implementation of drainage improvements, interagency coordination, floodplain management, and other land-use controls as needed to reduce potential damages and adverse development in flooded areas.

The following tasks are a part of this overall study:

• Develop and update existing and future conditions for the Bullhead Gulch and Prince Tributary watershed.
• Perform a field visit and inspection of the existing drainage facilities, documenting the drainage facilities with photographs, description of the drainage facility, and an assessment of the condition of the drainage facilities.
• Define watershed and sub-watershed boundaries consistent with MHFD guidance and evaluate hydrologic peak flows and volumes for the existing and future land-use watershed conditions with existing drainage infrastructure for reasonableness.
• Collection and evaluation of available reports and studies on existing drainage facilities, zoning and land ownership plans, current and future land use plans, and other drainage-related information.
• Coordination and meetings with the project stakeholders.
• Field Investigation to identify major drainage structures, existing problem locations, and hydraulic parameters.
• Evaluation of the hydraulic capacity of the existing drainage system and facilities.
• Development of drainageway improvement alternatives that address stakeholders’ future needs.
• Evaluation of alternatives based on criteria, estimated construction costs, potential flooding, planning constraints, and other related issues.
• Preparation of an Alternatives Analysis document and a Conceptual Design document.